1. Okwu Mmalite

Zinc telluride (ZnTe) bụ ihe dị mkpa maka semiconductor otu II-VI nke nwere nhazi bandgap kpọmkwem. N'okpomọkụ ụlọ, bandgap ya dị ihe dịka 2.26eV, ọ na-achọtakwa ọtụtụ ojiji na ngwaọrụ optoelectronic, mkpụrụ ndụ anyanwụ, ihe nchọpụta radieshon, na mpaghara ndị ọzọ. Isiokwu a ga-enye nkọwa zuru ezu gbasara usoro njikọta dị iche iche maka zinc telluride, gụnyere mmeghachi omume siri ike, mbufe vapor, ụzọ dabere na ngwọta, epitaxy beam molecular, wdg. A ga-akọwa usoro ọ bụla nke ọma n'ihe gbasara ụkpụrụ ya, usoro ya, uru na ọghọm ya, na ihe ndị dị mkpa a ga-atụle.

2. Usoro Mmeghachi omume nke Steeti Solid-State maka ZnTe Synthesis

2.1 Ụkpụrụ

Usoro mmeghachi omume siri ike bụ ụzọ kachasị ochie maka ịkwadebe zinc telluride, ebe zinc na tellurium dị ọcha na-emeghachi omume ozugbo na oke okpomọkụ iji mepụta ZnTe:

Zn + Te → ZnTe

2.2 Usoro zuru ezu

2.2.1 Nkwadebe Ihe Ndị A Na-anaghị Arụpụta

1. Nhọrọ Ihe: Jiri granules zinc dị ọcha na mkpụrụ tellurium dị ọcha nke ≥99.999% dị ka ihe mmalite.
2. Ọgwụgwọ Ihe:
   • Ọgwụgwọ Zinc: Buru ụzọ mikpuo na mmiri hydrochloric acid (5%) ruo otu nkeji iji wepụ ihe ndị dị n'elu, sachaa ya na mmiri e tinyere n'ime ion, saa ya na ethanol na-anaghị amịkọrọ mmiri, wee mechaa kpọọ nkụ n'ime oven vacuum na okpomọkụ 60°C ruo awa abụọ.
   • Ọgwụgwọ Tellurium: Buru ụzọ mikpuo n'ime mmiri aqua regia (HNO₃:HCl=1:3) ruo sekọnd iri atọ iji wepụ ihe ndị dị n'elu, sachaa ya na mmiri deionized ruo mgbe ọ ga-anọpụ iche, saa ya na ethanol anhydrous, wee mechaa kpọọ nkụ n'ime oven vacuum na 80°C ruo awa atọ.
3. Ịtụle: Tụọ ihe ndị e ji arụ ọrụ n'ime oke stoichiometric (Zn:Te=1:1). Ọ bụrụ na e lee anya na ọ ga-ekwe omume imebi zinc n'oge okpomọkụ dị elu, a pụrụ itinye ihe karịrị 2-3% nke ihe ndị a.

2.2.2 Ngwakọta Ihe

1. Ịgweri na Ịgwakọta: Tinye zinc na tellurium a tụrụ n'ime ihe e ji agate mee ma ghee ya ruo nkeji iri atọ n'ime igbe uwe aka jupụtara na argon ruo mgbe ha ga-agwakọta otu otu.
2. Ịkpụcha ntụ ntụ: Tinye ntụ ntụ agwakọtara n'ime ebu wee pịa n'ime mpekere nwere dayameta nke 10-20mm n'okpuru nrụgide 10-15MPa.

2.2.3 Nkwadebe nke arịa mmeghachi omume

1. Ọgwụgwọ Tube Quartz: Họrọ tube quartz dị ọcha nke ukwuu (dayameta dị n'ime 20-30mm, ọkpụrụkpụ mgbidi 2-3mm), buru ụzọ tinye ya na aqua regia ruo awa 24, sachaa ya nke ọma na mmiri e tinyere ion, ma kpọọ nkụ n'ime oven na okpomọkụ 120°C.
2. Ịchụpụ: Tinye mkpụrụ osisi ndị e ji ihe ndị a rụọ n'ime ọkpọkọ quartz, jikọọ na sistemu vacuum, wee kwapụ ruo ≤10⁻³Pa.
3. Mmechi: Jiri ọkụ hydrogen-oxygen mechie ọkpọkọ quartz ahụ, hụ na ogologo mkpuchi ya ruru ≥50mm maka ikuku na-anaghị ekpuchi.

2.2.4 Mmeghachi omume okpomọkụ dị elu

1. Oge Mbụ nke Ịkpọ Ọkụ: Tinye tube quartz a kpọchiri akpọchi n'ime ite ọkpọkọ ma kpoo ya ruo 400°C na ọnụego nke 2-3°C/min, jide ya ruo awa 12 iji kwe ka mmeghachi omume mbụ dị n'etiti zinc na tellurium.
2. Nkeji nke Abụọ nke Okpomọkụ: Gaa n'ihu na-ekpo ọkụ ruo 950-1050°C (n'okpuru ebe quartz na-eme ka ọ dị nro nke 1100°C) na 1-2°C/min, na-ejide ya ruo awa 24-48.
3. Ịkpọchi Tube: N'oge okpomọkụ dị elu, tụgharịa ọkụ ahụ na 45° kwa awa abụọ ma maa jijiji ugboro ugboro iji hụ na ngwakọta nke ihe ndị na-eme ka ihe dị nro gwakọtara nke ọma.
4. Ịjụ oyi: Mgbe emechara mmeghachi omume ahụ, jụọ oyi nwayọ nwayọ ruo okpomọkụ ụlọ na 0.5-1°C/min iji gbochie mgbawa nke ihe nlele n'ihi nrụgide okpomọkụ.

2.2.5 Nhazi Ngwaahịa

1. Mwepụ Ngwaahịa: Mepee tube quartz n'ime igbe uwe aka wee wepụ ngwaahịa mmeghachi omume ahụ.
2. Ịchacha: Tinyeghachi ngwaahịa ahụ ka ọ bụrụ ntụ ntụ iji wepụ ihe ọ bụla na-anaghị emeghachi omume.
3. Ịkwanye: Tinye ntụ ntụ ahụ n'ime okpomọkụ 600°C n'okpuru ikuku argon ruo awa asatọ iji belata nrụgide dị n'ime ya ma melite ịdị mma nke kristal.
4. Nhazi njirimara: Mee XRD, SEM, EDS, wdg, iji gosi na ọ dị ọcha nke usoro na ihe mejupụtara kemịkalụ.

2.3 Nhazi Nhazi Usoro

1. Njikwa Okpomọkụ: Okpomọkụ mmeghachi omume kacha mma bụ 1000±20°C. Okpomọkụ dị ala nwere ike ibute mmeghachi omume na-ezughị ezu, ebe okpomọkụ dị elu nwere ike ibute mgbanwe zinc.
2. Njikwa Oge: Oge njide kwesịrị ịbụ ≥ awa 24 iji hụ na mmeghachi omume zuru oke.
3. Ọnụego Oyi: Oyi nwayọ nwayọ (0.5-1°C/min) na-eme ka mkpụrụ kristal buru ibu.

2.4 Uru na ọghọm nyocha

Uru:

• Usoro dị mfe, ihe achọrọ maka akụrụngwa dị ala
• Dabara adaba maka mmepụta ogbe
• Ịdị ọcha dị elu nke ngwaahịa

Ihe ọghọm:

• Okpomọkụ mmeghachi omume dị elu, oriri ike dị elu
• Nkesa nha ọka na-abụghị otu
• Nwere ike ịnwe obere ihe ndị na-anaghị emetụta mmeghachi omume

3. Ụzọ Nbugharị Uzuoku maka Njikọ ZnTe

3.1 Ụkpụrụ

Usoro mbufe uzuoku na-eji gas ebu ibu ibuga uzuoku ndị na-eme ihe ike na mpaghara okpomọkụ dị ala maka itinye ha, na-enweta uto ntụziaka nke ZnTe site na ijikwa mgbanwe okpomọkụ. A na-ejikarị iodine eme ihe dị ka ihe na-eme ka ihe na-ebugharị:

ZnTe(s) + I₂(g) ⇌ ZnI₂(g) + 1/2Te₂(g)

3.2 Usoro zuru ezu

3.2.1 Nkwadebe Ihe Ndị A Na-anaghị Arụpụta

1. Nhọrọ Ihe: Jiri ntụ ZnTe dị ọcha nke ukwuu (ịdị ọcha ≥99.999%) ma ọ bụ ntụ Zn na Te agwakọtara agwakọta nke ọma.
2. Nkwadebe maka ihe eji ebuga ihe: kristal iodine dị ọcha nke ukwuu (ịdị ọcha ≥99.99%), ọnụọgụ nke tube mmeghachi omume 5-10mg/cm³.
3. Ọgwụgwọ Tube Quartz: Otu ihe ahụ dị ka usoro mmeghachi omume siri ike, mana a chọrọ tube quartz ndị dị ogologo (300-400mm).

3.2.2 Ibu Ibu Tube

1. Ntinye ihe: Tinye ntụ ZnTe ma ọ bụ ngwakọta Zn+Te n'otu nsọtụ nke ọkpọkọ quartz.
2. Mgbakwunye Iodine: Tinye kristal iodine na tube quartz n'ime igbe uwe aka.
3. Ịkwapụ: Kwapụ ruo ≤10⁻³Pa.
4. Mkpuchi: Jiri ọkụ hydrogen-oxygen mechie ya, na-eme ka ọkpọkọ ahụ kwụ ọtọ.

3.2.3 Ntọala nke Gradient Okpomọkụ

1. Okpomọkụ Mpaghara Na-ekpo Ọkụ: Edobere ya ka ọ bụrụ 850-900°C.
2. Okpomọkụ Mpaghara Oyi: Edobere ya ka ọ bụrụ 750-800°C.
3. Ogologo Mpaghara Gradient: Ihe dị ka 100-150mm.

3.2.4 Usoro uto

1. Nkebi Mbụ: Kpoo ọkụ ruo 500°C na 3°C/min, jide ya ruo awa abụọ ka o kwe omume ịmalite mmeghachi omume n'etiti iodine na ihe ndị e ji eme ihe.
2. Nkeji nke Abụọ: Gaa n'ihu na-ekpo ọkụ ruo na okpomọkụ edobere, na-echekwa ọnọdụ okpomọkụ ahụ, ma na-eto ruo ụbọchị 7-14.
3. Ịjụ oyi: Mgbe ị gwụchara uto ahụ, jụọ oyi ruo okpomọkụ ụlọ na 1°C/min.

3.2.5 Nchịkọta Ngwaahịa

1. Mmepe Tube: Mepee tube quartz n'ime igbe uwe aka.
2. Nchịkọta: Chịkọta kristal ZnTe otu na njedebe oyi.
3. Nhicha: Jiri ethanol na-anaghị agbaze mmiri hichaa ya nke ọma ruo nkeji ise iji wepụ iodine nke na-amịkọrọ n'elu ya.

3.3 Isi Njikwa Usoro

1. Njikwa Ọnụọgụ Iodine: Ntinye Iodine na-emetụta ọnụego mbufe; oke kachasị mma bụ 5-8mg/cm³.
2. Igwe Ọkụ: Nọgide na-enwe ike ịgbasa n'ime 50-100°C.
3. Oge uto: Ọ na-abụkarị ụbọchị 7-14, dabere na nha kristal achọrọ.

3.4 Uru na ọghọm nyocha

Uru:

• Enwere ike nweta kristal dị elu
• Nha kristal buru ibu
• Ịdị ọcha dị elu

Ihe ọghọm:

• Usoro uto dị ogologo
• Ihe achọrọ maka akụrụngwa dị elu
• Mkpụrụ dị ala

4. Ụzọ dabere na ngwọta maka njikọta ihe eji eme ihe na ZnTe

4.1 Ụkpụrụ

Usoro ndị dabere na ngwọta na-achịkwa mmeghachi omume ndị bu ụzọ na ngwọta iji kwadebe nanoparticles ma ọ bụ nanowires ZnTe. Mmeghachi omume a na-ahụkarị bụ:

Zn²⁺ + HTe⁻ + OH⁻ → ZnTe + H₂O

4.2 Usoro zuru ezu

4.2.1 Nkwadebe maka ihe eji eme ihe

1. Isi mmalite Zinc: Zinc acetate (Zn(CH₃COO)₂·2H₂O), ịdị ọcha ≥99.99%.
2. Isi Iyi Tellurium: Tellurium dioxide (TeO₂), ịdị ọcha ≥99.99%.
3. Ihe na-ebelata ihe mgbu: Sodium borohydride (NaBH₄), ịdị ọcha ≥98%.
4. Ihe ndị na-agbaze: Mmiri e wepụrụ ion, ethylenediamine, ethanol.
5. Ihe na-eme ka mmiri dị n'ime ahụ pụta ìhè: Cetyltrimethylammonium bromide (CTAB).

4.2.2 Nkwadebe maka Tellurium Precursor

1. Nkwadebe Ngwọta: Gbazee 0.1mmol TeO₂ na mmiri 20ml nke a gwakọtara agwakọta.
2. Mmeghachi omume Mbelata: Tinye 0.5mmol NaBH₄, gwakọta ya na magnet maka nkeji iri atọ iji mepụta ngwọta HTe⁻.
   TeO₂ + 3BH₄⁻ + 3H₂O → HTe⁻ + 3B(OH)₃ + 3H₂↑
3. Ikuku Nchedo: Nọgide na-agba nitrogen gburugburu iji gbochie oxidation.

4.2.3 Njikọta Nanoparticle ZnTe

1. Nkwadebe Ngwọta Zinc: Gbazee 0.1mmol zinc acetate na ethylenediamine 30ml.
2. Mmeghachi omume ngwakọta: Tinye mmiri HTe⁻ nwayọ na mmiri zinc, meghachi omume na 80°C ruo awa isii.
3. Ntinye ihe: Mgbe mmeghachi omume gasịrị, centrifuge na 10,000rpm maka nkeji iri iji chịkọta ngwaahịa ahụ.
4. Ịsa: Jiri ethanol na mmiri e tinyere n'ọkụ saa ya ugboro atọ.
5. Ịkpọcha: Kpochapu ihe mkpofu na okpomọkụ 60°C ruo awa isii.

4.2.4 ZnTe Nanowire Synthesis

1. Mgbakwunye Nlereanya: Tinye 0.2g CTAB na ngwọta zinc.
2. Mmeghachi omume Hydrothermal: Bufee ihe ngwọta agwakọtara na autoclave nke nwere 50ml nke Teflon, megharịa ya na 180°C ruo awa iri na abụọ.
3. Nhazi mgbe emechara: Otu ihe ahụ dị ka nke nanoparticles.

4.3 Nhazi Usoro Nhazi

1. Njikwa Okpomọkụ: 80-90°C maka nanoparticles, 180-200°C maka nanowires.
2. Uru pH: Nọgide na-enwe n'etiti 9-11.
3. Oge Mmeghachi omume: awa 4-6 maka nanoparticles, awa 12-24 maka nanowires.

4.4 Uru na ọghọm nyocha

Uru:

• Mmeghachi omume dị ala, na-azọpụta ike
• Ọdịdị na nha a na-achịkwa
• Dabara adaba maka mmepụta buru ibu

Ihe ọghọm:

• Ngwaahịa nwere ike ịnwe ihe ndị na-adịghị ọcha
• Chọrọ nhazi mgbe emechara
• Ọdịdị kristal dị ala

5. Mkpụrụ ndụ ihe nketa nke Molecular Beam Epitaxy (MBE) maka nkwadebe ihe nkiri ZnTe Thin

5.1 Ụkpụrụ

MBE na-eto ihe nkiri dị gịrịgịrị ZnTe otu kristal site n'iduzi ogwe molekul nke Zn na Te n'elu ihe dị n'okpuru ọnọdụ ikuku dị elu, na-achịkwa oke ọkụ eletrik na okpomọkụ nke ihe dị n'ime ya nke ọma.

5.2 Usoro zuru ezu

5.2.1 Nkwadebe Sistemụ

1. Sistemụ Vacuum: Vacuum ntọala ≤1×10⁻⁸Pa.
2. Nkwadebe Isi Mmalite:
   • Isi iyi Zinc: Zinc dị ọcha nke 6N dị na BN Crucible.
   • Isi iyi Tellurium: Tellurium dị ọcha nke 6N na PBN crucible.
3. Nkwadebe ihe ndị e ji mee ihe:
   • Ihe mejupụtara GaAs (100) a na-ejikarị eme ihe.
   • Nhicha ihe ndị dị n'ime ala: Nhicha ihe ndị na-agbaze ihe dị n'ime ala → Ịchacha ihe ndị na-eme ka ihe ghara ịdị ọcha → Ịsacha mmiri nke e ji ion mee → Ịkpọcha nitrogen.

5.2.2 Usoro Uto

1. Mkpọchi ihe ndị dị n'ime ala: Mee achịcha na 200°C maka otu awa iji wepụ ihe ndị na-adọrọ adọrọ n'elu ya.
2. Mwepụ Oxide: Kpoo ọkụ ruo 580°C, jide ya ruo nkeji iri iji wepụ oxides dị n'elu.
3. Uto nke oyi akwa nchekwa: Jụụ ruo 300°C, too oyi akwa nchekwa ZnTe 10nm.
4. Isi uto:
   • Okpomọkụ ala: 280-320°C.
   • Nrụgide nhata nke ogwe zinc: 1×10⁻⁶ Torr.
   • Nrụgide nhata nke ogwe Tellurium: 2×10⁻⁶ Torr.
   • A na-achịkwa oke V/III na 1.5-2.0.
   • Ọnụego uto: 0.5-1μm/h.
5. Ịkwanye Mkpọchi: Mgbe o tochara, tinye ya na okpomọkụ 250°C maka nkeji iri atọ.

5.2.3 Nlekota n'ime ebe ahụ

1. Nlekota RHEED: Nleba anya n'oge a na-ahụ maka nhazigharị elu na ụdị uto.
2. Oke Spectrometry: Na-enyocha ike nke molekul.
3. Thermometry Infrared: Njikwa okpomọkụ nke ihe ndị dị n'okpuru ala kpọmkwem.

5.3 Isi Njikwa Usoro

1. Njikwa Okpomọkụ: Okpomọkụ nke ihe ndị dị n'okpuru ala na-emetụta àgwà kristal na ọdịdị elu.
2. Oke mgbanwe nke Beam: Oke nke Te/Zn na-emetụta ụdị ntụpọ na njupụta.
3. Ọnụọgụ uto: Ọnụọgụ dị ala na-eme ka mma kristal dịkwuo mma.

5.4 Uru na ọghọm nyocha

Uru:

• Nhazi ziri ezi na njikwa doping.
• Ihe nkiri kristal dị elu.
• Ebe dị larịị nke atom nwere ike iru.

Ihe ọghọm:

• Ngwa dị oke ọnụ.
• Ọnụego uto dị nwayọ.
• Chọrọ nkà ọrụ dị elu.

6. Ụzọ Ndị Ọzọ Si Eme Ihe

6.1 Mwepụ Uzuoku Kemịkalụ (CVD)

1. Ihe ndị na-ebute ụzọ: Diethylzinc (DEZn) na diisopropyltelluride (DIPTe).
2. Okpomọkụ Mmeghachi omume: 400-500°C.
3. Gas ebu: Nnupụta dị elu nke nitrogen ma ọ bụ hydrogen.
4. Nrụgide: Ikuku ma ọ bụ obere nrụgide (10-100Torr).

6.2 Mmiri ọkụ

1. Isi mmalite ihe: Ntụ ntụ ZnTe dị ọcha nke ukwuu.
2. Ọkwa ikuku: ≤1×10⁻⁴Pa.
3. Okpomọkụ nke ikuku mmiri: 1000-1100°C.
4. Okpomọkụ ala: 200-300°C.

7. Mmechi

E nwere ụzọ dị iche iche e si emepụta zinc telluride, nke ọ bụla nwere uru na ọghọm nke ya. Mmeghachi omume siri ike dabara adaba maka nkwadebe ihe buru ibu, mbufe uzuoku na-emepụta kristal dị elu, ụzọ ngwọta dị mma maka ihe ndị dị na nanomaterials, a na-ejikwa MBE maka ihe nkiri dị gịrịgịrị dị elu. Ngwa bara uru kwesịrị ịhọrọ usoro kwesịrị ekwesị dabere na ihe achọrọ, yana njikwa siri ike nke paramita usoro iji nweta ihe ZnTe dị elu. Ntuziaka ndị ga-eme n'ọdịnihu gụnyere njikọta obere okpomọkụ, njikwa ọdịdị, na nhazi usoro doping.